RESUMO
This paper focuses on the application of quantitative electric tomography (qEEGT) to map changes in EEG generators for detection of early signs of ischemia in patients with acute middle cerebral artery stroke. Thirty-two patients were studied with the diagnosis of acute ischemic stroke of the left middle cerebral artery territory, within the first 24 hours of their clinical evolution. Variable Resolution Electrical Tomography was used for estimating EEG source generators. High resolution source Z-spectra and 3- dimensional images of Z values for all the sources at each frequency were obtained for all cases. To estimate statistically significant increments and decrements of brain electric activity within the frequency spectra, the t-Student vs. Zero test was performed. A significant increment of delta activity was observed on the affected vascular territory, and a more extensive increment of theta activity was detected. A significant alpha decrement was found in the parieto-occipital region of the affected cerebral hemisphere (left), and in the medial and posterior region of the right hemisphere. These findings suggest that qEEGT Z delta images are probably related to the main ischemic core within the affected arterial territory; penumbra, diaschisis, edema, might explain those observed theta and alpha abnormalities. It was concluded that qEEGT is useful for the detection of early signs of ischemia in acute ischemic stroke.
Assuntos
Ritmo alfa , Infarto da Artéria Cerebral Média/patologia , Imageamento por Ressonância Magnética/métodos , Ritmo Teta , Doença Aguda , Adulto , Idoso , Idoso de 80 Anos ou mais , Edema Encefálico/patologia , Diagnóstico Precoce , Feminino , Humanos , Masculino , Pessoa de Meia-IdadeRESUMO
Referimos un nuevo caso de lipoma del cuerpo calloso cuyo diagnóstico se realiza por los estudios neurorradiológicos. Se señala la utilidad de la radiografía simple del cráneo que orienta el diagnóstico. Se describen las alteraciones angiográficas que son típicas de la afección y se enumeran las alteraciones de la TAC por lo que se evidencia que este estudio es el más útil y práctico y permite garantizar la identificación del proceso con un método de diagnóstico no invasivo. El lipoma del cuerpo calloso es una afección de presentación poco frecuente, cuyo diagnóstico se efectúa atendiendo a los hallazgos neurorradiológicos. Hay algo más de 100 ejemplos referidos en la literatura . Nosotros comunicamos el caso de un nuevo paciente y discutimos las características de la entidad